1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93
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34 * $Id: dead_vnops.c,v 1.14 1997/09/02 20:06:08 bde Exp $
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34 * $Id: dead_vnops.c,v 1.15 1997/09/14 02:57:46 peter Exp $ |
35 */ 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40#include <sys/vnode.h> 41#include <sys/buf.h> 42 43static int chkvnlock __P((struct vnode *)); 44/* 45 * Prototypes for dead operations on vnodes. 46 */ 47static int dead_badop __P((void)); 48static int dead_ebadf __P((void)); 49static int dead_lookup __P((struct vop_lookup_args *)); 50#define dead_create ((int (*) __P((struct vop_create_args *)))dead_badop) 51#define dead_mknod ((int (*) __P((struct vop_mknod_args *)))dead_badop) 52static int dead_open __P((struct vop_open_args *)); 53#define dead_close ((int (*) __P((struct vop_close_args *)))nullop) 54#define dead_access ((int (*) __P((struct vop_access_args *)))dead_ebadf) 55#define dead_getattr ((int (*) __P((struct vop_getattr_args *)))dead_ebadf) 56#define dead_setattr ((int (*) __P((struct vop_setattr_args *)))dead_ebadf) 57static int dead_read __P((struct vop_read_args *)); 58static int dead_write __P((struct vop_write_args *)); 59static int dead_ioctl __P((struct vop_ioctl_args *)); 60#define dead_poll vop_nopoll 61#define dead_mmap ((int (*) __P((struct vop_mmap_args *)))dead_badop) 62#define dead_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 63#define dead_seek ((int (*) __P((struct vop_seek_args *)))nullop) 64#define dead_remove ((int (*) __P((struct vop_remove_args *)))dead_badop) 65#define dead_link ((int (*) __P((struct vop_link_args *)))dead_badop) 66#define dead_rename ((int (*) __P((struct vop_rename_args *)))dead_badop) 67#define dead_mkdir ((int (*) __P((struct vop_mkdir_args *)))dead_badop) 68#define dead_rmdir ((int (*) __P((struct vop_rmdir_args *)))dead_badop) 69#define dead_symlink ((int (*) __P((struct vop_symlink_args *)))dead_badop) 70#define dead_readdir ((int (*) __P((struct vop_readdir_args *)))dead_ebadf) 71#define dead_readlink ((int (*) __P((struct vop_readlink_args *)))dead_ebadf) 72#define dead_abortop ((int (*) __P((struct vop_abortop_args *)))dead_badop) 73#define dead_inactive ((int (*) __P((struct vop_inactive_args *)))nullop) 74#define dead_reclaim ((int (*) __P((struct vop_reclaim_args *)))nullop) 75static int dead_lock __P((struct vop_lock_args *)); 76#define dead_unlock ((int (*) __P((struct vop_unlock_args *)))vop_nounlock) 77static int dead_bmap __P((struct vop_bmap_args *)); 78static int dead_strategy __P((struct vop_strategy_args *)); 79static int dead_print __P((struct vop_print_args *)); 80#define dead_islocked ((int(*) __P((struct vop_islocked_args *)))vop_noislocked) 81#define dead_pathconf ((int (*) __P((struct vop_pathconf_args *)))dead_ebadf) 82#define dead_advlock ((int (*) __P((struct vop_advlock_args *)))dead_ebadf) 83#define dead_blkatoff ((int (*) __P((struct vop_blkatoff_args *)))dead_badop) 84#define dead_valloc ((int (*) __P((struct vop_valloc_args *)))dead_badop) 85#define dead_vfree ((int (*) __P((struct vop_vfree_args *)))dead_badop) 86#define dead_truncate ((int (*) __P((struct vop_truncate_args *)))nullop) 87#define dead_update ((int (*) __P((struct vop_update_args *)))nullop) 88#define dead_bwrite ((int (*) __P((struct vop_bwrite_args *)))nullop) 89 90vop_t **dead_vnodeop_p; 91static struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
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92 { &vop_default_desc, (vop_t *)vn_default_error },
93 { &vop_lookup_desc, (vop_t *)dead_lookup }, /* lookup */
94/* XXX: vop_cachedlookup */
95 { &vop_create_desc, (vop_t *)dead_create }, /* create */
96/* XXX: vop_whiteout */
97 { &vop_mknod_desc, (vop_t *)dead_mknod }, /* mknod */
98 { &vop_open_desc, (vop_t *)dead_open }, /* open */
99 { &vop_close_desc, (vop_t *)dead_close }, /* close */
100 { &vop_access_desc, (vop_t *)dead_access }, /* access */
101 { &vop_getattr_desc, (vop_t *)dead_getattr }, /* getattr */
102 { &vop_setattr_desc, (vop_t *)dead_setattr }, /* setattr */
103 { &vop_read_desc, (vop_t *)dead_read }, /* read */
104 { &vop_write_desc, (vop_t *)dead_write }, /* write */
105/* XXX: vop_lease */
106 { &vop_ioctl_desc, (vop_t *)dead_ioctl }, /* ioctl */
107 { &vop_poll_desc, (vop_t *)dead_poll }, /* poll */
108/* XXX: vop_revoke */
109 { &vop_mmap_desc, (vop_t *)dead_mmap }, /* mmap */
110 { &vop_fsync_desc, (vop_t *)dead_fsync }, /* fsync */
111 { &vop_seek_desc, (vop_t *)dead_seek }, /* seek */
112 { &vop_remove_desc, (vop_t *)dead_remove }, /* remove */
113 { &vop_link_desc, (vop_t *)dead_link }, /* link */
114 { &vop_rename_desc, (vop_t *)dead_rename }, /* rename */
115 { &vop_mkdir_desc, (vop_t *)dead_mkdir }, /* mkdir */
116 { &vop_rmdir_desc, (vop_t *)dead_rmdir }, /* rmdir */
117 { &vop_symlink_desc, (vop_t *)dead_symlink }, /* symlink */
118 { &vop_readdir_desc, (vop_t *)dead_readdir }, /* readdir */
119 { &vop_readlink_desc, (vop_t *)dead_readlink }, /* readlink */
120 { &vop_abortop_desc, (vop_t *)dead_abortop }, /* abortop */
121 { &vop_inactive_desc, (vop_t *)dead_inactive }, /* inactive */
122 { &vop_reclaim_desc, (vop_t *)dead_reclaim }, /* reclaim */
123 { &vop_lock_desc, (vop_t *)dead_lock }, /* lock */
124 { &vop_unlock_desc, (vop_t *)dead_unlock }, /* unlock */
125 { &vop_bmap_desc, (vop_t *)dead_bmap }, /* bmap */
126 { &vop_strategy_desc, (vop_t *)dead_strategy }, /* strategy */
127 { &vop_print_desc, (vop_t *)dead_print }, /* print */
128 { &vop_islocked_desc, (vop_t *)dead_islocked }, /* islocked */
129 { &vop_pathconf_desc, (vop_t *)dead_pathconf }, /* pathconf */
130 { &vop_advlock_desc, (vop_t *)dead_advlock }, /* advlock */
131 { &vop_blkatoff_desc, (vop_t *)dead_blkatoff }, /* blkatoff */
132 { &vop_valloc_desc, (vop_t *)dead_valloc }, /* valloc */
133/* XXX: vop_reallocblks */
134 { &vop_vfree_desc, (vop_t *)dead_vfree }, /* vfree */
135 { &vop_truncate_desc, (vop_t *)dead_truncate }, /* truncate */
136 { &vop_update_desc, (vop_t *)dead_update }, /* update */
137/* XXX: vop_getpages */
138/* XXX: vop_putpages */
139 { &vop_bwrite_desc, (vop_t *)dead_bwrite }, /* bwrite */
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92 { &vop_default_desc, (vop_t *) vn_default_error }, 93 { &vop_abortop_desc, (vop_t *) dead_abortop }, 94 { &vop_access_desc, (vop_t *) dead_access }, 95 { &vop_advlock_desc, (vop_t *) dead_advlock }, 96 { &vop_blkatoff_desc, (vop_t *) dead_blkatoff }, 97 { &vop_bmap_desc, (vop_t *) dead_bmap }, 98 { &vop_bwrite_desc, (vop_t *) dead_bwrite }, 99 { &vop_close_desc, (vop_t *) dead_close }, 100 { &vop_create_desc, (vop_t *) dead_create }, 101 { &vop_fsync_desc, (vop_t *) dead_fsync }, 102 { &vop_getattr_desc, (vop_t *) dead_getattr }, 103 { &vop_inactive_desc, (vop_t *) dead_inactive }, 104 { &vop_ioctl_desc, (vop_t *) dead_ioctl }, 105 { &vop_islocked_desc, (vop_t *) dead_islocked }, 106 { &vop_link_desc, (vop_t *) dead_link }, 107 { &vop_lock_desc, (vop_t *) dead_lock }, 108 { &vop_lookup_desc, (vop_t *) dead_lookup }, 109 { &vop_mkdir_desc, (vop_t *) dead_mkdir }, 110 { &vop_mknod_desc, (vop_t *) dead_mknod }, 111 { &vop_mmap_desc, (vop_t *) dead_mmap }, 112 { &vop_open_desc, (vop_t *) dead_open }, 113 { &vop_pathconf_desc, (vop_t *) dead_pathconf }, 114 { &vop_poll_desc, (vop_t *) dead_poll }, 115 { &vop_print_desc, (vop_t *) dead_print }, 116 { &vop_read_desc, (vop_t *) dead_read }, 117 { &vop_readdir_desc, (vop_t *) dead_readdir }, 118 { &vop_readlink_desc, (vop_t *) dead_readlink }, 119 { &vop_reclaim_desc, (vop_t *) dead_reclaim }, 120 { &vop_remove_desc, (vop_t *) dead_remove }, 121 { &vop_rename_desc, (vop_t *) dead_rename }, 122 { &vop_rmdir_desc, (vop_t *) dead_rmdir }, 123 { &vop_seek_desc, (vop_t *) dead_seek }, 124 { &vop_setattr_desc, (vop_t *) dead_setattr }, 125 { &vop_strategy_desc, (vop_t *) dead_strategy }, 126 { &vop_symlink_desc, (vop_t *) dead_symlink }, 127 { &vop_truncate_desc, (vop_t *) dead_truncate }, 128 { &vop_unlock_desc, (vop_t *) dead_unlock }, 129 { &vop_update_desc, (vop_t *) dead_update }, 130 { &vop_valloc_desc, (vop_t *) dead_valloc }, 131 { &vop_vfree_desc, (vop_t *) dead_vfree }, 132 { &vop_write_desc, (vop_t *) dead_write }, |
133 { NULL, NULL } 134}; 135static struct vnodeopv_desc dead_vnodeop_opv_desc = 136 { &dead_vnodeop_p, dead_vnodeop_entries }; 137 138VNODEOP_SET(dead_vnodeop_opv_desc); 139 140/* 141 * Trivial lookup routine that always fails. 142 */ 143/* ARGSUSED */ 144static int 145dead_lookup(ap) 146 struct vop_lookup_args /* { 147 struct vnode * a_dvp; 148 struct vnode ** a_vpp; 149 struct componentname * a_cnp; 150 } */ *ap; 151{ 152 153 *ap->a_vpp = NULL; 154 return (ENOTDIR); 155} 156 157/* 158 * Open always fails as if device did not exist. 159 */ 160/* ARGSUSED */ 161static int 162dead_open(ap) 163 struct vop_open_args /* { 164 struct vnode *a_vp; 165 int a_mode; 166 struct ucred *a_cred; 167 struct proc *a_p; 168 } */ *ap; 169{ 170 171 return (ENXIO); 172} 173 174/* 175 * Vnode op for read 176 */ 177/* ARGSUSED */ 178static int 179dead_read(ap) 180 struct vop_read_args /* { 181 struct vnode *a_vp; 182 struct uio *a_uio; 183 int a_ioflag; 184 struct ucred *a_cred; 185 } */ *ap; 186{ 187 188 if (chkvnlock(ap->a_vp)) 189 panic("dead_read: lock"); 190#if 0 191 /* Lite2 behaviour */ 192 /* 193 * Return EOF for tty devices, EIO for others 194 */ 195 if ((ap->a_vp->v_flag & VISTTY) == 0) 196 return (EIO); 197#else 198 /* 199 * Return EOF for character devices, EIO for others 200 */ 201 if (ap->a_vp->v_type != VCHR) 202 return (EIO); 203#endif 204 return (0); 205} 206 207/* 208 * Vnode op for write 209 */ 210/* ARGSUSED */ 211static int 212dead_write(ap) 213 struct vop_write_args /* { 214 struct vnode *a_vp; 215 struct uio *a_uio; 216 int a_ioflag; 217 struct ucred *a_cred; 218 } */ *ap; 219{ 220 221 if (chkvnlock(ap->a_vp)) 222 panic("dead_write: lock"); 223 return (EIO); 224} 225 226/* 227 * Device ioctl operation. 228 */ 229/* ARGSUSED */ 230static int 231dead_ioctl(ap) 232 struct vop_ioctl_args /* { 233 struct vnode *a_vp; 234 int a_command; 235 caddr_t a_data; 236 int a_fflag; 237 struct ucred *a_cred; 238 struct proc *a_p; 239 } */ *ap; 240{ 241 242 if (!chkvnlock(ap->a_vp)) 243 return (EBADF); 244 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 245} 246 247/* 248 * Just call the device strategy routine 249 */ 250static int 251dead_strategy(ap) 252 struct vop_strategy_args /* { 253 struct buf *a_bp; 254 } */ *ap; 255{ 256 257 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 258 ap->a_bp->b_flags |= B_ERROR; 259 biodone(ap->a_bp); 260 return (EIO); 261 } 262 return (VOP_STRATEGY(ap->a_bp)); 263} 264 265/* 266 * Wait until the vnode has finished changing state. 267 */ 268static int 269dead_lock(ap) 270 struct vop_lock_args /* { 271 struct vnode *a_vp; 272 int a_flags; 273 struct proc *a_p; 274 } */ *ap; 275{ 276 struct vnode *vp = ap->a_vp; 277 278 /* 279 * Since we are not using the lock manager, we must clear 280 * the interlock here. 281 */ 282 if (ap->a_flags & LK_INTERLOCK) { 283 simple_unlock(&vp->v_interlock); 284 ap->a_flags &= ~LK_INTERLOCK; 285 } 286 if (!chkvnlock(vp)) 287 return (0); 288 return (VCALL(vp, VOFFSET(vop_lock), ap)); 289} 290 291/* 292 * Wait until the vnode has finished changing state. 293 */ 294static int 295dead_bmap(ap) 296 struct vop_bmap_args /* { 297 struct vnode *a_vp; 298 daddr_t a_bn; 299 struct vnode **a_vpp; 300 daddr_t *a_bnp; 301 int *a_runp; 302 int *a_runb; 303 } */ *ap; 304{ 305 306 if (!chkvnlock(ap->a_vp)) 307 return (EIO); 308 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb)); 309} 310 311/* 312 * Print out the contents of a dead vnode. 313 */ 314/* ARGSUSED */ 315static int 316dead_print(ap) 317 struct vop_print_args /* { 318 struct vnode *a_vp; 319 } */ *ap; 320{ 321 322 printf("tag VT_NON, dead vnode\n"); 323 return (0); 324} 325 326/* 327 * Empty vnode failed operation 328 */ 329static int 330dead_ebadf() 331{ 332 333 return (EBADF); 334} 335 336/* 337 * Empty vnode bad operation 338 */ 339static int 340dead_badop() 341{ 342 343 panic("dead_badop called"); 344 /* NOTREACHED */ 345} 346 347/* 348 * We have to wait during times when the vnode is 349 * in a state of change. 350 */ 351int 352chkvnlock(vp) 353 register struct vnode *vp; 354{ 355 int locked = 0; 356 357 while (vp->v_flag & VXLOCK) { 358 vp->v_flag |= VXWANT; 359 (void) tsleep((caddr_t)vp, PINOD, "ckvnlk", 0); 360 locked = 1; 361 } 362 return (locked); 363}
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